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Produce workers at the Woodinville store were putting the bananas out on the sales floor when they saw something strange, said Sgt. Ryan Abbott with the King County Sheriff's Office.

"One of the boxes had brown paper in it, which caught their attention and then they looked further and found these bricks," Abbott said. "They called the police and we went out there and it ended up being 22 kilos of cocaine with a street value of $550,000."

That's almost 50 pounds of cocaine.

The cocaine was surrounded by ordinary boxes of bananas, which were stuck together for shipment, Abbott said.

"We're still trying to determine where it all came from. That's under investigation. We do know it was all shipped from a central warehouse, but we don't know where it originated yet, so that's a work in progress," he said.

Bellingham Police Lt. Claudia Murphy told CNN affiliate KOMO that 23 kilograms (50.7 pounds) of cocaine were found hidden in a box of bananas at a Bellingham Safeway.

"I know that Safeway has been great and they went through every single box in their warehouse and all of their stores just to make sure there's no other issues," Abbott said.

He said he's never heard of anything like this happening -- especially not at three stores on the same day.

"We see cocaine out here, but we don't see this large amounts and we don't see it in Safeway and we don't see it in banana boxes," he said.

It's not the first time bananas have been used to smuggle cocaine.

In April, German authorities found hundreds of kilograms of cocaine, worth around €25 million ($28 million), that had been shipped to Aldi stores.